Friday, Nov 20, 2009 at 10:02
KK,
Stated simplistically,
Inverters themselves consume your 12v
battery power when running.
Yes, it's only a small amount of 12v power in a small capacity Inverter, but in a much larger capacity Inverter it's a much larger amount of your 12v battery capacity, to do exactly same amount of work, with the same device connected.
With a quality 300 watt inverter running a 300 Watt load, there is nil *avoidable* 12v
battery power 'waste' - the inverter 12v loss's are still there and they can't be avoided.
However, with the exact same 300 watt load running from a 1,OOO watt Inverter there is huge waste (by comparison) of your 12v
battery power used just to run the 1,OOO watt Inverter itself.
When a 300 watt inverter is running, "?" of your 12v
battery power is used as Inverter self consumption, whether it's running only a small light - or the same light, and a tv and a computer and a fridge also (assuming all devices ~300 watts total)
Liken it to using an economical 4 cylinder car to go shopping, verses a V12 ***** to do the exact same quick shopping trip.
You will still bring home the same loaf of bread in each vehicle, one vehicle will cost a few cents to run to the shops and the other would cost more than the bread, if you get my point :-))
(if 'someone' wants to get all pedantic and use actual % and Voltage numbers then nominate the Inverter also, because all
Inverters are not created equal, some are more efficient than others)
That's the reason I use a 4 plug power-board wired direct to my inverter to run/charge up to 4 devices simultaneously from my 300 watt psw inverter, it consumes less of my 12v power that way than when running/charging the same 4 devices individually.
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